Machine for grinding cams.



. M. A. THIEL. MACHINE FOR GRINDING CAMS. APPLIOATION FILED MAR. 31,19Q6.

' 957,392. Patented May 10, 1910.

2 SHEETS-SHEET 1.

WITNESSES: INVENTOR ATTORN EY UNITED sma ls PATENT onnicn.

MARTIN A. THIEL, 0F WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO THE WESTING-HOUSE MACHINE COMPANY, A CORPORATION OF PENNSYLVANIA.

MACHINE FOR GRINDING CAMS.

Specification of Letters Patent.

Patented May It), 1916.

To all whom it may concern:

Be it known that I, MARTIN A. THIEL, a citizen of the United States, anda resident of Wilkinsburg, in the county of Allegheny and State ofPennsylvania, have made a new and useful Invention in Machines forGrinding Cams, of which the following is a specification.

This invention relates to grinding machines and more particularly to theproduction of machines adapted to be utilized in grinding and finishingcams.

The object'of this invention is the produc-' tion of means for grindingcams and cam surfaces which may be utilized in connection with anyinding machine.

A further 0 ject is the production of cheap and simple means inconnection with a grinding machine whereby the labor of grinding camsand cam surfaces is greatly reduce In the drawings accompanying thisapplication and forming a part thereof; Figure 1 is a side elevation ofa machine embodying my invention. Fig. 2 is an end elevation of amachine shown in Fig.1.

The frame portion 3 of a grinding machine is provided with bearings 4 inwhich the shaft 5, which is provided with grinders or emery wheels 6anddriven by a pulley 7, is mounted. Brackets 8 are mounted on the frameportion 3 and are provided with suitable ways in which rods 11 aremounted. The rods 11 are adapted to reciprocate longitudinally throughthe ways and are provided at one end with a'rigidly mounted former plate12, the face 10 of which is parallel'with the grinding face of one ofthe grinders 6. The plate 12 is provided with a lug 13 in which the endof a threaded rod 14 is mounted. The threaded portion of the rod extendsthrough a suitable tapped hole in the bracket 8 and is rovided with aknurled hand-wheel 15, a I the position of the plate by moving it towardand away fromethe bracket 8. A reciprocating carriage 16 is mounted on ashaft or arbor 17, which is mounted in a bearing housing 18 throughwhich it. is adapted to move longitudinally. The carriage is providedwith bearings 19 in which a rotatable shaft 21 is j ournaled. The shaft21 is provided with a worm wheel 22 and is adapted to carry at one end apattern cam 23 in contact with the former plate 12 and apted to adjust acam 24 in contact with the grinding face of one of the finishing wheels6. A shaft 25 is suitably journaled on the carriage portion and isprovided with an operating hand wheel 26 and a worm 27 which meshes withthe worm wheel 22. A lever, 28 is rigidly mounted in a suitably locatedlug 29, which is formed integrally with the carriage l6, and is providedwith a counter-balancing weight 30, which is adapted to slidelongitudinally along the rod, and is provided with a set screw 31. Thearrangement is such that for different positions of the weight 29 thecam 24 will be held against the face of the rinder disk 6, and the cam23 against the face of the former plate 12 with greater or lesspressure.

In grinding a cam, a rough cam that is to be shaped and finished isplaced on the shaft 21 at 24 and the former plate 12 is moved to such aposition that it will contact with the .pattern cam 23 and regulate byits position the amount to be ground from the cam 24,

'and the shaft 21 is rotated by turning the hand wheel 26. It isapparent that the cam at 24 will be ground to correspond in shape to thecam 23 and that its size will be dependent on the position of the formerplate relative to the grinding surface of the disk 6. The weight 29 canbe moved to such a position that the cam 24 will be held against thegrindin surface with greater or less pressure an the carriage 16 canbemoved relative to the bearing 18 so that any portion of the grindingsurface of the disk 6 will be efiective. It is apparent that the cam maybe easily finished to correspond in contour with the. former cam andthat the carriage 16 and brackets 8 may be connected with a grindingmachine of any type.

What I claim is:

1. In combination in a grinding machine, a rotatable grinding wheel, anadjustable former plate, the operating face of which is parallel to thegrinding face of said wheel, an oscillating carriage, a rotatable shaftmounted on said carria e, a former cam mounted upon said sha t andadapted to contact with said former plate to cause said carriage to movetoward and away from said grinding wheel, and an adjustably weighted armrigidly connected to said carriage to cause contact between said cam andsaid former plate.

2. In combination in a grinding machine,

a rotatable grinding wheel, an adjustable former plate, the operatingface of which is parallel to the'grinding face of said wheel, anoscillating carriage, a rotatable shaft mounted on said carriage, aformer cam mounted on said shaft and adapted to contact with said formerplate and to cause said carriage to move toward and away from saidgrinding wheel, an adjustably weighted arm secured to said carriage tocause contact between said cam and said former plate, and means formovin said former plate backward and forwar relative to the grindingface of said wheel.

3. In combination in a grinding machine, a rotatable grinding Wheel, aformer plate,

an oscillating carriage, a rotatable shaft mounted on said carriage, aformer cam mounted on said shaft and adapted to contact with said formerplate to cause said carriage to move toward and away from said grindingwheel, and an adjustably Weighted arm secured to said carriage to causecontact between said cam and said former plate during the revolution ofsaid cam.

In testimony whereof, I have hereunto subscribed my name this 80th dayof March,

MARTIN A. THIEL. Witnesses:

CHARLES W. MGGHEE, E. W. MOCALLISTER.

